HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Athens

$333+ Cheap flights from Ontario (ONT) to Athens (ATH)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/16. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ATH
Apr 22 — Apr 291
Wed 4/22
Wed 4/29
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Athens with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Ontario to Athens

Cheapest flights from Ontario to Athens
Explore the most affordable flight options available from Ontario to Athens. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 23, 2026.

This Air Canada deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/295:00 am
ONT
-
ATH
2 stops19h 10m
Air Canada
Wed 9/23:25 pm
ATH
-
ONT
2 stops31h 13m
Air Canada
Deal found 3/19$747
This United Airlines deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/237:00 am
ONT
-
ATH
1 stop17h 35m
United Airlines
Thu 11/126:25 am
ATH
-
ONT
2 stops21h 22m
United Airlines
Deal found 3/22$750
This United Airlines deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/187:00 am
ONT
-
ATH
1 stop17h 35m
United Airlines
Thu 9/1711:45 am
ATH
-
ONT
2 stops21h 13m
United Airlines
Deal found 3/21$760
This Delta deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/67:00 am
ONT
-
ATH
1 stop18h 00m
Delta
Tue 9/296:00 am
ATH
-
ONT
2 stops22h 01m
Delta
Deal found 3/21$768
This KLM deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/197:00 am
ONT
-
ATH
1 stop17h 00m
KLM
Wed 9/29:45 am
ATH
-
ONT
1 stop18h 16m
KLM
Deal found 3/21$785
This KLM deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/510:15 pm
ONT
-
ATH
1 stop26h 45m
KLM
Thu 5/149:45 am
ATH
-
ONT
1 stop18h 51m
KLM
Deal found 3/22$794
This Delta deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/510:15 pm
ONT
-
ATH
2 stops23h 35m
Delta
Thu 5/149:45 am
ATH
-
ONT
2 stops23h 49m
Delta
Deal found 3/22$798
This Delta deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/511:53 am
ONT
-
ATH
2 stops25h 07m
Delta
Tue 5/126:00 am
ATH
-
ONT
2 stops27h 34m
Delta
Deal found 3/21$802
This Air France deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/187:00 am
ONT
-
ATH
1 stop18h 00m
Multiple Airlines
Tue 9/19:45 am
ATH
-
ONT
1 stop18h 16m
Multiple Airlines
Deal found 3/20$810
This British Airways deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/54:52 pm
ONT
-
ATH
2 stops23h 18m
British Airways
Thu 5/148:00 pm
ATH
-
ONT
2 stops30h 22m
British Airways
Deal found 3/20$811
This oojo deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/64:54 pm
ONT
-
ATH
2 stops23h 21m
British Airways
Wed 9/308:00 pm
ATH
-
ONT
2 stops31h 48m
British Airways
Deal found 3/22$812
This oojo deal was found by Cheapflights users on 3/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2210:56 pm
ONT
-
ATH
2 stops23h 59m
Turkish Airlines
Fri 10/210:00 pm
ATH
-
ONT
2 stops33h 29m
Turkish Airlines
Deal found 3/18$813

Find flight deals from Ontario to Athens

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Athens (ATH). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated March 23, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$747
(Air Canada)

One-way from

$333
(SmartFares)

Popular in

June

Cheapest in

February

Average price

$711
Provider with most accurate pricing for Ontario-Athens Eleftherios V. flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-Athens Eleftherios V. flights.
Search Deals
From Ontario to Athens Eleftherios V.
Search Deals
One-way flight from Ontario to Athens Eleftherios V.
Search Deals
Highest demand for flights based on searches. 26% potential increase in price ($301 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 10% potential price decrease ($81 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Athens that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 23, 2026.
Use the filters below to find and compare flights from Ontario to Athens that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 5/5

11:53 am-11:00 pm

2 stops25h 07m

Athens Eleftherios V.

Thu 5/14

9:45 am-6:36 pm

1 stop18h 51m

$798

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 5/5

11:53 am-11:00 pm

2 stops25h 07m

Athens Eleftherios V.

Tue 5/12

6:00 am-11:34 pm

2 stops27h 34m

$802

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 4/20

5:10 am-11:05 pm

2 stops31h 55m

Athens Eleftherios V.

Sun 5/3

12:10 pm-5:52 pm

2 stops39h 42m

$841
Quickest round-trip

OntarioAthens

ONT - ATH

ONTATH

Ontario

Tue 8/25

7:00 am-11:00 am

1 stop18h 00m

Athens Eleftherios V.

Sat 9/5

9:45 am-6:01 pm

1 stop18h 16m

$845

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 4/20

10:15 pm-11:00 am

1 stop26h 45m

Athens Eleftherios V.

Sun 5/3

9:45 am-6:33 pm

1 stop18h 48m

$930

OntarioAthens

ONT - ATH

ONTATH

Ontario

Wed 8/12

7:20 am-11:45 am

1 stop18h 25m

Athens Eleftherios V.

Sun 8/23

2:00 pm-11:06 pm

1 stop19h 06m

$1,195

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sun 9/6

11:59 pm-3:45 pm

2 stops29h 46m

Athens Eleftherios V.

Wed 9/16

4:30 am-9:29 pm

2 stops26h 59m

$1,233

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sat 4/4

10:25 pm-11:00 am

1 stop26h 35m

Athens Eleftherios V.

Sun 4/12

5:45 pm-10:37 pm

2 stops38h 52m

$1,278

OntarioAthens

ONT - ATH

ONTATH

Ontario

Wed 9/2

7:00 am-11:00 am

1 stop18h 00m

Athens Eleftherios V.

Sat 9/12

9:45 am-6:01 pm

1 stop18h 16m

$1,287

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 5/18

11:25 pm-6:15 pm

2 stops32h 50m

Athens Eleftherios V.

Mon 6/1

4:30 pm-8:45 pm

2 stops38h 15m

$1,301

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/23

Showing 1-10 of 24 resultsSorted by cheapest first
1
2
3

Compare providers for flights from Ontario to Athens

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Athens in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars
OvagoPrice Accuracy2 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Ontario-Athens flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Athens flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Athens flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-Athens flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Athens flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Ontario to Athens

Have a flexible travel schedule? Discover the best time to fly to Athens from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Athens

What is the cheapest month to book a flight from Ontario to Athens?

Currently, August is the cheapest month in which you can book a flight from Ontario to Athens (average of $419). Flying from Ontario to Athens in June is currently the most expensive (average of $646). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost to fly round-trip from Ontario to Athens?

Reviews of airlines servicing Athens

Get insights into the airlines that provide service to Athens. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Athens. Reviews last updated March 23, 2026.
Read reviews from past customers who have flown United Airlines from Ontario to Athens. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,460 reviews

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
9,460 reviews
United Airlines
7.4
Good
9,460 reviews

Comfort

7.3

Crew

8.1

Entertainment

7.1

Food

6.6

Overall

7.4

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Related info for your journey

Find useful and relevant information for your journey from Ontario to Athens. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Ontario to Athens?

    Airlines like Delta, United Airlines, and KLM fly from Ontario to Athens in about 18h. The time it takes to get you to your destination can typically vary by up to 13h 55m. Ontario and Athens are separated by a distance of 6879 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What is the cheapest airline to fly from Ontario to Athens round-trip?

    According to our current data, United Airlines ($588), offers the cheapest pricing from Ontario to Athens. United Airlines is priced at 30% lower than the current average price of a flight leaving 3 months from now.

  • Can I find deals for flights from Ontario to Athens that include hotel bookings?

    Yes. In addition to deals on Ontario to Athens flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Athens?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Athens.

  • Can I find deals for business class flights from Ontario to Athens?

    Yes. Cheapflights offers flight deals from Ontario to Athens by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ontario to Athens?

    Currently, August is the cheapest month in which you can book a flight from Ontario to Athens (average of $419). Flying from Ontario to Athens in June is currently the most expensive (average of $646). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Athens?

Book flights to Athens if you plan to visit one of these locations
Glyfada
Tolo
Piraeus
Galaxidi

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top airline flying from Ontario to Athens

Discover the top airline that operate flights from Ontario to Athens. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 23, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$588Average$823FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.